液体媒质超声波电机的饱和流速特性

为提高液体媒质超声波电机的最高转速，对电机的饱和流速特性进行了理论分析，得出液体媒质中声场的非线性是饱和流速产生的主要原因．在此基础上从液体性质和转子结构角度对其进行了重点的实验研究．在液体性质方面，从液体高度、液体浓度和非线性参数3方面分析了它们对饱和流速的影响，从中得出，存在一个最佳的液位高度和溶液浓度使饱和流速的值达到最大，且饱和流速和非线性参数呈反方向变化．在转子结构方面，从转子直径、叶片高度、叶片数和所用材料密度4方面对饱和流速进行了研究，得出了它们与饱和流速的关系，提出了从控制液位高度、液体质量分数、使用合适类型的液体和转子结构4方面提高电机最高转速，使电机能运行在较宽的范围，实验结果与理论分析结果相一致．

Saturated Flow Velocity Characteristic of Ultrasonic Motor Driving Fluid Directly

To increase the speed range, the saturated flow velocity on ultrasonic motor driving fluid is studied. This paper finds that the cause of the saturation is the non-linearity of the acoustic field in the fluid. Research and experiments are conducted on the rotor structural parameters and the fluid characteristics which include the height, the concentration and the nonlinear parameters. The experiments prove that the adoption of optimal height and concentration of the fluid can maximize the saturated flow velocity. The saturated flow velocity is in reverse to the nonlinear parameters. The rotor structural parameters are the radius, the blade height, the blade number and the material density. The rotors with larger saturated flow velocity is found, providing reference for the selection of an appropriate rotor. Some methods are applied to increase the saturated flow velocity, including controlling the depth of fluid, concentrating solution and applying appropriate fluids and the rotor structure. The experiments prove that these methods can increase the rotating speed limit of the motor.